Questions Refer to the Following Research Study

Questions refer to the following research study:
Ronda would like to assess the effects of a reading comprehension course on the scores of students. She gives a group of remedial students a reading comprehension pretest and then randomly assigns them to either the treatment group or the control group. Shortly after the treatment, she measures their reading comprehension scores again.
-What kind of research design did Ronda use?

A) Solomon four-group design
B) Non-equivalent group design
C) Pretest-posttest control-group design
D) Interrupted time-series design